CORRECTING and REPLACING Arrowhead Appoints Patrick O’Brien as General Counsel

PASADENA, Calif.–(BUSINESS WIRE)–

Arrowhead Research Corporation corrects its press release issued on

December 4, 2014, to correct the statement regarding “inducement” grants.

The corrected release reads:

ARROWHEAD APPOINTS PATRICK O’BRIEN AS GENERAL COUNSEL

Arrowhead Research Corporation (NASDAQ: ARWR), a biopharmaceutical

company developing targeted RNAi therapeutics, today announced that it

has appointed Patrick O’Brien as General Counsel. In this role, Mr.

O’Brien will have overall responsibility to manage all of the Company’s

legal matters.

“Patrick will be an integral part of the Arrowhead management team,”

said Christopher Anzalone, Ph.D., Arrowhead’s President and Chief

Executive Officer. “His twenty year history of representing and advising

biopharmaceutical companies from multiple vantage points will be a great

asset as we move forward.”

Mr. O’Brien comes to Arrowhead from Shire where he served as Group Vice

President, Legal in Shire’s Boston office. Prior to that, he was Chief

Legal Officer for Shire’s regenerative medicine division. Mr. O’Brien

has also served as Assistant General Counsel for Johnson & Johnson and

Vice President, Law of its Centocor Ortho-Biotech business unit,

Regulatory Counsel at the U.S. Food and Drug Administration, and as

outside counsel to biopharmaceutical high technology companies while

engaged in private practice. He holds B.S. in Pharmacy, Pharm.D., and

J.D. degrees from the University of Arizona.

About Arrowhead Research Corporation

Arrowhead Research Corporation is a biopharmaceutical company developing

targeted RNAi therapeutics. The company is leveraging its proprietary

Dynamic Polyconjugate delivery platform to develop targeted drugs based

on the RNA interference mechanism that efficiently silences

disease-causing genes. Arrowhead’s pipeline includes ARC-520 for chronic

hepatitis B virus, ARC-AAT for liver disease associated with Alpha-1

antitrypsin deficiency, and partner-based programs in obesity and

oncology.

For more information please visit http://www.arrowheadresearch.com,

or follow us on Twitter @ArrowRes.

To be added to the Company’s email list and receive news directly,

please visit http://ir.arrowheadresearch.com/alerts.cfm.

NASDAQ Notice

As an inducement to entering into employment with the Company, on

December 2, 2014, Patrick O’Brien and one other new employee of the

Company were awarded “inducement” grants of options and restricted stock

units (RSU) under Rule 5635(c)(4) of the NASDAQ Marketplace Rules. The

option grants entitle Mr. O’Brien to purchase up to 90,000 shares of

common stock and the other employee to purchase up to 30,000 shares of

common stock, in each case outside of the Company’s stockholder-approved

equity incentive plans at an exercise price per share of $5.22, the last

reported closing price of the Company’s common stock on the date of

grant. Additionally, Mr. O’Brien was awarded 30,000 restricted stock

units outside of the Company’s stockholder-approved equity incentive

plans. The options vest and become exercisable over a period of four

years from the date of grant and the RSUs vest annually in three equal

installments.

Source: Arrowhead Research Corporation

Arrowhead Research Corporation
Vince Anzalone, CFA
626-304-3400
ir@arrowres.com
or
Investor

Relations:
The Trout Group
Lauren Glaser
646-378-2972
ir@arrowres.com
or
Media:
Russo

Partners
Martina Schwarzkopf, Ph.D.
212-845-4292
martina.schwarzkopf@russopartnersllc.com

Source: Arrowhead Research Corporation

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